本标准实施规程涉及国际单位制（缩写为SI）或SI公制单位在纸浆、纸张和纸板领域的应用。TAPPI法规要求在TAPPI测试方法和其他TAPPI出版物中使用国际单位制作为首选单位 ISO标准31:1981和ISO标准1000:1981的各个部分给出了SI的详细信息。然而，应用这些信息并不总是容易的。例如，一些量可以用不同的单位表示，都在国际单位制范围内。这种变化可能会导致报告测试结果和引用属性值的混乱。 为了克服纸浆、纸张和纸板领域的此类问题，ISO/TC6在ISO标准5651:1989（E）中推荐了适当的装置。本标准实施规程中复制了这些信息以及其他信息和建议。

This Standard Practice deals with the application of the International System of units (abbreviated SI) or SI metric units within the field of pulp, paper, and paperboard. TAPPI regulations require the use of the SI units as the preferred units in TAPPI Test Methods and other TAPPI publications Details of the SI are given in the various parts of ISO Standard 31: 1981 and ISO Standard 1000: 1981. Application of this information is not always easy, however. For instance some quantities can be expressed in different units, all within the SI. Such variations can lead to confusion in reporting test results and quoting property values. In order to overcome such problems within the pulp, paper, and paperboard field, ISO/TC6 has recommended appropriate units in ISO Standard 5651: 1989 (E). These are reproduced in this Standard Practice, together with other information and recommendations.